[SMARTY] resource - variable

Hello,
I have page content (string) in a variable {$page_content}. I can simply
"echo" this content by smarty like this

My content: {$page_content}

I need to process smarty tags in this string. The content (string) can
be saved into a file or database and then called by {include} plugin
like this

{include file="my-page-content.tpl"} and it will work.

But I need something like resource-from-variable. I created the most
simpliest piece of code which works.

Important code parts:

// resource
function var_get_template($tpl_name, &$tpl_source, &$smarty_obj)
{
	$tpl_source = $tpl_name;
	return TRUE;
}
...
...
$smarty->register_resource('var',
	array(
		$page,
		'var_get_template',
		'var_get_timestamp',
		'var_get_secure',
		'var_get_trusted'
	)
);

And template

{include file="var:`$page_content`"}


Does anybody have any hints about this?

Thanks,
Michal

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